Abstract: An optical device includes a light receiving element for detecting light reflected and transmitted from a subject; a voltage part for providing a first bias voltage or a second bias voltage to the light receiving element; and a controller for controlling the voltage part so that the second bias voltage provided from the voltage part is synchronized with a light output of a light emitting part to be provided to the light receiving element.

Abstract: The present invention relates to a device for uniformly charging a battery pack, the device charging the battery pack by variably adjusting a balancing current according to a voltage difference between battery cells using an Internet of Things method based on low power Bluetooth communication. A device for uniformly charging a battery pack by variably adjusting a balancing current using Internet of Things based on a Bluetooth communication includes: a balancing part; a voltage monitoring part; an integrated controller; measuring point selecting switches; DACs; Bluetooth receiving parts transmitting a control signal received from the integrated controller to the measuring point selecting switches and the DACs by being connected thereto; and a Bluetooth transmitting part transmitting a signal for controlling the measuring point selecting switches and the DACs.

Abstract: The present invention relates to an apparatus and method of balance charging a plurality of battery cells serially connected to each other. The apparatus for balance charging the battery pack includes: a charger supplying a charge current to a plurality of battery; a voltage sensor sensing cell voltages of the plurality of battery cells; an integrated controller determining whether or not to perform a balance process and detecting a target battery cell to be balanced; balance resistors and switching elements, each of the balance resistors and switching elements being respectively connected to the plurality of battery cells in parallel; a balance controller controlling a switching element connected to the target battery cell to be balanced, thereby the cell voltage of the target battery cell is consumed by an associated balance resistor; and a charge current controller decreasing the charge current output from the charger.